Electric detonator-fuse.



Nu. 677,477. Patented July 2, lam. 6. SMITH & u. some. ELECTRIC DETONATOR FUSE.

(Application filed 811.23, 1900.

(No Model.)

Wimsses'.

UNI ED STATES ATENT OFFICE.

GEORGE SMITH AND DAVID CORRIE, O'F POLMONT, SCOTLAND.

ELECTRIC DETONATOR-FUSE.

- SPECIFICATION forming part of Letters Patent No. 677,477, dated July 2, 1901.-

Application filed February 23, 1900. Serial No. 6 ,294. (No model.)

To all whom it may concern:

Be it known that we, GEORGE SMITH and DAVID OORRIE, of Polmont, in the county of Stirling, Scotland, have invented certain new and useful Improvements in Electric Fuses and Electric Detonator-Fuses, (for which we have applied for a patent in Great Britain,

No. 16,040, and bearing the date of the 5th of- August, 1899,) of which the following is a IO specification.

This invention relates to improvements in electric fuses and electric detonator-fuses, the

,objectof which is to provide a fuse in-which wires are firmly fixed and cannot be pushed out of the fuse shell or tube.

In the drawings which form apart of this v-iapplication, Figure 1 is a View, partly in section, showing the inner tube and the plug wires suitably insulated and braided or twisted together.

. forming parts of our detonator-fuse. Fig. 2

is a section of the detonator-fuse.

I The electric primer a consists of two copper Thetwisted wires are threaded through a suitable opening in a lead plug 1), which is pressed closely on and secured firmly to the wires by means of suitable pliers. The fuse-head thus prepared is forced into a small tube 0, of metal or other-suitable material,having one end tapering and which is turned over or bent down onto the lead plug at its other end. In this way the lead plug is firmly fixed into the tube, the taper .and bent-over p013 tions of which prevent any movement either the plug. The flashing mixture is then put in the tube in the usual way.

The tube 0 is backward or forward of forced by a suitable machine into the detonator-tube d, where'the bulging portion of the small tube 0 engages with the sides of the detonator-tube and makes a tight joint, so that it is impossible to remove the inner tube from the outer or to backward or forward.

To make the inner tube more secure, the

edge of the outer or .detonator tube may be as shown in Fig. 2,

turned over the inner, which effectually prevents the latter from being movedin any direction. 7

Having now particularly described andascertained the nature of our invention and in what manner the same is to be performed, we declare that what we claim is-- g An electric fuse composed of a'detonator tube, tapering tube contained in'said detonator-tube, a soft plug contained in said tapering tube and having the walls of the latter pressed inwardly thereabout, said plug having an opening to receive the'primer, as set forth.

In testimony whereof we afiix our signatures in' the presence of two witnesses.

- GEORGE SMITH.

DAVID CORRIE.

Witnesses:

' JJAmEs M. ANDERSON,

JOHN Bnvon.

pull the wires l 

